html,body,h1,h2,h3,h4,h5,h6,div{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.liaotianbody{
    width: 450px;
    height: 800px;
    margin: 20px auto;
    overflow: scroll;
    overflow-x: hidden;
    padding: 20px;
    border: 1px solid red;
    position: relative;
}
.liaotianbody::-webkit-scrollbar { display: none; }
.clearfix::after{
    content: '';
    display: block;
    clear: both;
}
.l{
    float: left;
}
.r{
    float: right;
}
.shou,.fa{
    padding: 15px;
}
/* 头像 */
.toux{
    width: 50px;
    height: 50px;
    background-color: red;
    border-radius: 50%;
    overflow: hidden;
}
/* 内容 */
.content{
    max-width: 153px;
    min-height: 50px;
    background-color: yellowgreen;
    padding:15px 20px;
    line-height: 16px;
    border-radius: 8px;
    position: relative;
    margin: 0 20px;
}
.l.content::before{
    content: '';
    display: block;
    width: 15px;
    height: 15px;
    border-radius: 4px;
    transform:translateY(-7.5px) rotate(45deg);
    background-color: yellowgreen;
    position: absolute;
    top: 25px;
    left: -7px;
    z-index: 0;
}
.r.content::before{
    content: '';
    display: block;
    width: 15px;
    height: 15px;
    border-radius: 4px;
    transform:translateY(-7.5px) rotate(45deg);
    background-color: yellowgreen;
    position: absolute;
    top: 25px;
    right: -7px;
    z-index: 0;
}
/* 输入框 */
.shurubox{
    position: fixed;
    bottom: 0px;
    height: 150px;
    width: 408px;
    background-color: red;
    z-index: 999;
}